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number_math_division.go
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/
number_math_division.go
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package transform
import (
"context"
"encoding/json"
"fmt"
"strconv"
"github.com/brexhq/substation/config"
iconfig "github.com/brexhq/substation/internal/config"
"github.com/brexhq/substation/message"
)
func newNumberMathDivision(_ context.Context, cfg config.Config) (*numberMathDivision, error) {
conf := numberMathConfig{}
if err := iconfig.Decode(cfg.Settings, &conf); err != nil {
return nil, fmt.Errorf("transform: number_math_division: %v", err)
}
if err := conf.Validate(); err != nil {
return nil, fmt.Errorf("transform: number_math_division: %v", err)
}
tf := numberMathDivision{
conf: conf,
isObject: conf.Object.SourceKey != "" && conf.Object.TargetKey != "",
}
return &tf, nil
}
type numberMathDivision struct {
conf numberMathConfig
isObject bool
}
func (tf *numberMathDivision) Transform(ctx context.Context, msg *message.Message) ([]*message.Message, error) {
if msg.IsControl() {
return []*message.Message{msg}, nil
}
var value message.Value
if tf.isObject {
value = msg.GetValue(tf.conf.Object.SourceKey)
} else {
value = bytesToValue(msg.Data())
}
if !value.Exists() {
return []*message.Message{msg}, nil
}
if !value.IsArray() {
return []*message.Message{msg}, nil
}
var vFloat64 float64
for i, val := range value.Array() {
if i == 0 {
vFloat64 = val.Float()
continue
}
vFloat64 /= val.Float()
}
strFloat64 := numberFloat64ToString(vFloat64)
if !tf.isObject {
msg.SetData([]byte(strFloat64))
return []*message.Message{msg}, nil
}
f, err := strconv.ParseFloat(strFloat64, 64)
if err != nil {
return nil, fmt.Errorf("transform: number_math_division: %v", err)
}
if err := msg.SetValue(tf.conf.Object.TargetKey, f); err != nil {
return nil, fmt.Errorf("transform: number_math_division: %v", err)
}
return []*message.Message{msg}, nil
}
func (tf *numberMathDivision) String() string {
b, _ := json.Marshal(tf.conf)
return string(b)
}